class Person {

    public Person(){
        System.out.println("无参的构造方法被掉用了...");
    }
    public Person(int age){
        this();
        System.out.println("有参的构造方法被调用了...");
    }
}
public class Examplell{
    public static void main(String[]args){
        Person p=new Person(18);
    }
}

